fix: resolve Kotlin compiler warnings in quartz and quic

- Replace unused Unit/null expressions in statement-position when branches
  with empty blocks (CommandSerializer, QuicConnection, QuicConnectionParser,
  Http3FrameReader, WtPeerStreamDemux).
- Suppress DEPRECATION on KindNames.names, which intentionally registers the
  deprecated GitReplyEvent and TorrentCommentEvent kinds for display.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018nqdy4VTLKidUWzGTJPja9

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/kinds/KindNames.kt

@@ -326,6 +326,7 @@ data class KindName(
  * platform concern layered on top, never a fork of this data.
  */
 object KindNames {
+    @Suppress("DEPRECATION") // registry intentionally names deprecated kinds (GitReply, TorrentComment) for display
     val names: Map<Int, KindName> =
         mapOf(
             AcceptedBadgeSetEvent.KIND to KindName("Accepted Badge Set", "58"),

quartz/src/jvmAndroid/kotlin/com/vitorpamplona/quartz/nip01Core/relay/commands/toRelay/CommandSerializer.kt

@@ -83,9 +83,7 @@ class CommandSerializer : StdSerializer<Command>(Command::class.java) {
                 gen.writeString(cmd.subId)
             }
 
-            else -> {
-                null
-            }
+            else -> {}
         }
 
         gen.writeEndArray()

quic/src/commonMain/kotlin/com/vitorpamplona/quic/connection/QuicConnection.kt

@@ -2523,9 +2523,7 @@ class QuicConnection(
             PathValidator.RecordResult.Stored,
             PathValidator.RecordResult.Duplicate,
             PathValidator.RecordResult.AlreadyRetired,
-            -> {
-                Unit
-            }
+            -> {}
 
             PathValidator.RecordResult.PoolFull -> {
                 // Peer over-issued past its own advertised
@@ -2573,11 +2571,9 @@ class QuicConnection(
         // same path before the next outbound packet (which would
         // otherwise stamp a now-retired CID).
         when (val rotation = pathValidator.forceRotateToHigherSequence()) {
-            null -> {
-                Unit
-            }
-
             // active CID is still valid; nothing to do.
+            null -> {}
+
             PathValidator.ForcedRotationResult.NoSpareCid -> {
                 // Watermark forced retirement of the active CID but
                 // the pool is empty — we have nothing valid to use.
@@ -2613,9 +2609,7 @@ class QuicConnection(
         when (val outcome = pathValidator.applyPathResponse(payload)) {
             PathValidator.ValidationOutcome.NotValidating,
             PathValidator.ValidationOutcome.PayloadMismatch,
-            -> {
-                Unit
-            }
+            -> {}
 
             is PathValidator.ValidationOutcome.Validated -> {
                 // Bug-7 fix: a valid PATH_RESPONSE proves the peer

quic/src/commonMain/kotlin/com/vitorpamplona/quic/connection/QuicConnectionParser.kt

@@ -852,9 +852,7 @@ private fun dispatchFrames(
                 // peer knows it just violated the spec instead of
                 // having its bytes silently dropped.
                 when (stream.receive.insert(frame.offset, frame.data, frame.fin)) {
-                    com.vitorpamplona.quic.stream.ReceiveBuffer.InsertResult.OK -> {
-                        Unit
-                    }
+                    com.vitorpamplona.quic.stream.ReceiveBuffer.InsertResult.OK -> {}
 
                     com.vitorpamplona.quic.stream.ReceiveBuffer.InsertResult.OFFSET_PAST_FIN -> {
                         conn.markClosedExternally(

quic/src/commonMain/kotlin/com/vitorpamplona/quic/http3/Http3FrameReader.kt

@@ -165,9 +165,7 @@ class Http3FrameReader(
             )
         }
         when (context) {
-            StreamContext.UNCHECKED -> {
-                Unit
-            }
+            StreamContext.UNCHECKED -> {}
 
             StreamContext.CONTROL -> {
                 // §7.2.4: SETTINGS MUST be the first frame on the

quic/src/commonMain/kotlin/com/vitorpamplona/quic/webtransport/WtPeerStreamDemux.kt

@@ -491,9 +491,7 @@ class WtPeerStreamDemux(
                 }
 
                 // no new requests; we don't enforce yet
-                else -> {
-                    Unit
-                }
+                else -> {}
             }
         }
     }